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A146375 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 21, 9, 201, 25, 1634, 125, 22896, 1331, 494897, 18779, 18283376, 389231, 1000392247, 11969301, 84124514832, 573650431, 10424120801341, 41782304071, 1874244968782308, 4475707668912 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

Maximal 9 X 9 example

.0.1.0.0.1.0.0.1.0

.1.1.1.0.1.0.1.1.1

.0.1.0.1.1.1.0.1.0

.0.1.0.0.1.0.0.1.0

.0.0.0.0.0.0.0.0.0

.0.1.0.0.1.0.0.1.0

.0.1.0.1.1.1.0.1.0

.1.1.1.0.1.0.1.1.1

.0.1.0.0.1.0.0.1.0

CROSSREFS

Sequence in context: A040425 A040424 A220132 * A040423 A318648 A033341

Adjacent sequences:  A146372 A146373 A146374 * A146376 A146377 A146378

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 16 20:55 EDT 2019. Contains 328103 sequences. (Running on oeis4.)